Patent Number: 6,295,015

Title: Reference generator for demodulator calibration

Abstract: A reference generator includes a memory that stores reference data which, when clocked out of the memory, produces an ATSC compliant VSB reference signal substantially free of sub-harmonics of the clock signal. A digital-to-analog converter converts the clocked out reference data to an analog signal. The analog signal may be at low IF. An up converter is arranged to upconvert the output of the digital-to-analog converter to an RF reference signal. The RF reference signal can be used, for example, to calibrate a VSB demodulator.

Inventors: Jones; Gary A. (Hawthorn Woods, IL), Sgrignoli; Gary J. (Mt. Prospect, IL), Zhang; Minglu (Mundelein, IL)

Assignee: Zenith Electronics Corporation

International Classification: H03M 3/00 (20060101); H03M 003/00 ()

Expiration Date: 09/25/2018